core/plugin/service.go

package plugin

import (
	"maps"
	"net/http"

	"connectrpc.com/connect"
	"git.dev.alexdunmow.com/block/core/rbac"
)

// ServiceMount is a path + handler pair for an RPC service.
type ServiceMount struct {
	Path    string
	Handler http.Handler
}

// ConnectServiceBinding describes a plugin RPC service mounted with the core interceptor chain.
type ConnectServiceBinding struct {
	name        string
	build       func(opts ...connect.HandlerOption) (string, http.Handler)
	methodRoles map[string]rbac.Role
}

// NewConnectServiceBinding creates a service binding whose handler is always
// constructed by core with the supplied Connect handler options.
func NewConnectServiceBinding[T any](
	name string,
	svc T,
	constructor func(T, ...connect.HandlerOption) (string, http.Handler),
	methodRoles map[string]rbac.Role,
) ConnectServiceBinding {
	clonedRoles := make(map[string]rbac.Role, len(methodRoles))
	maps.Copy(clonedRoles, methodRoles)

	return ConnectServiceBinding{
		name: name,
		build: func(opts ...connect.HandlerOption) (string, http.Handler) {
			return constructor(svc, opts...)
		},
		methodRoles: clonedRoles,
	}
}

func (b ConnectServiceBinding) Name() string {
	return b.name
}

func (b ConnectServiceBinding) Build(opts ...connect.HandlerOption) (string, http.Handler) {
	return b.build(opts...)
}

func (b ConnectServiceBinding) MethodRoles() map[string]rbac.Role {
	cloned := make(map[string]rbac.Role, len(b.methodRoles))
	maps.Copy(cloned, b.methodRoles)
	return cloned
}

// ServiceRegistration bundles plugin RPC services with their RBAC method roles.
type ServiceRegistration struct {
	Services []ConnectServiceBinding
}